Hear Our Voices: A Powerful Retelling of the British Empire through 20 True Stories is a completely necessary book and one of the best biography collections I've read in awhile. This middle grade nonfiction book tackles what empires are, what the British Empire was specifically, how far it reached, and the damage it's done. Once it gets that intro out of the way (and yeah, all of that is just the intro!), it gives us twenty biographies (two page spreads with full illustrations and fairly detailed and accessible text) about different people who fought the empire, colonialism, and colonialist standards in their lives. There are figures from across the history of the British Empire (stretching from the seventeenth century to figures who are still living) and across the distance of the British Empire (including countries like Canada, Kenya, India, Ireland, Australia, Trinidad, China, Nigeria, and more), and it really gets into a lot of meaty ideas in a very accessible way. The art and the layout make it an appealing read that isn't too challenging, but the content covers a lot of information in a surprisingly limited amount of time.
This is essential reading for anyone middle grade and up looking to gain a better understanding of the history of anti-colonial and anti-imperial efforts, especially for folks living in the UK or former British colony. It's a great place to start learning and gives lots of information that could lead you down other learning paths. I highly recommend it.